Optimization of die sink EDM process parameters for the titanium alloys Ti6Al4V & Ti5553

In this study, the Die Sink electric discharge machining (EDM) of titanium alloys Ti6Al4V and Ti5553 with copper electrode material were conducted to find the optimum process parameters and to compare machinability of these alloys on sink EDM for same input design. The design of experiments was conducted using Taguchi method to find the optimum machining parameters such as current (I), Pulse on time (Ton) and Pulse off time (Toff) for various response parameters such as Material removal rate (MRR), Surface roughness (Ra) and Radial over cut (ROC). Mean effect plots and S/N ratios have been used to optimize the machining parameters of Die sink EDM on Ti6Al4V and Ti5553 using the Taguchi method. ANOVA is performed to find the percentage contribution of each input parameter on each output variable. The experimental results reveal that Ti5553 material machinability on sink EDM w.r.t metal MRR, Ra and ROC is better compared to Ti6Al4V material, this signifies the factor that Die sink EDM is best suited for harder materials.